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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3858a01cfb6237da6633662764447e25f6809d4c2a512d5516ffa845cba5b9' 
  AND token = 'aA6TKh6HNF3y0y7l61UK0ypJXJBkeHIaAVzDp/13TiI=' 
  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"
    }
  }
}