Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0a2f1b92a0ec66d56e29abd361afa4cba4449e4d5f066b8607cb20e65f4f27' 
  AND token = 'fObYFxVz88EQbO4uQmMfHqEC+vahmV8nVRWqyC873QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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