Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca043e8e35fd1f8314d7356d3eb6f6b5b038975ea85409215db9076785d2f07' 
  AND token = 'PeV8x2AOROpJRnJsOslCRPO8fYOxTHOedflBl7gU/aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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