Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2118b3aa6e92876a433ccff5a8f9088947a7fdc8c40d8f305747d7320568c1d5' 
  AND token = 'RaW8sVuFRO3kzWva2pJPIYzBsS63xG0Xy7Diie2n3Bs=' 
  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"
    }
  }
}