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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0e33a7aa90e625efc31b07d493923425c16a79378b4b2bd60732daae7be6a2' 
  AND token = 'omGgxHx5YaB+E+TJkpLl6Vfpj0JX87HNb7GGZZYZRGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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