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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c7d78d17d24a2bd6d69eb61816b6e184888a4acf9b0515ba55b4da9d0273c3' 
  AND token = 'y5q3qjUWOHv8DaDkDNYetTDTIuh52/aPjA3yHi52Xgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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