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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1535952837dd87f1274dc2d64f74df7302bdd06eab269fa6a9685137f5f65073' 
  AND token = 'JL18IL6Z08BC2ipJwM/aigEspf5vW8A9v19gvIoAC6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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