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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f06979e8b9b9c4411d623171f2ca3899af01cb194f1ee630ce0e3561efcd6b' 
  AND token = 'pRBslcCrG+iGQKGy+EHuILU5TbGNd696//dMme/yOIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}