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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca7bd000f18d188ec525b2705d5a1959ec1aee570c26072cdc6f0b10ff0eab9' 
  AND token = 'aDqdJrZqcsKzoLK6Ug4P2ACCW5BUDfRDyd1g0ai09cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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