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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50efd13a823a7c54519b0f4c73cca2b50080883cc2394fa3356e86ae5a4d8a68' 
  AND token = 'xopLLxih2IFSTKtEkJwndoMU6YJ5pbxdK4g54NUG+H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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