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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bbb7fe07b1e59f3d34f9bbe18c2b9b33289f1870756565db799635f05384f7' 
  AND token = 'KswetnuZtusw18gW8Wbinqp+ISu/Cj/NH19sF0dmXjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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