Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ca467793009b551f91e3345515ea297584a6ddda79aefadc30a84f1d8d4e6d' 
  AND token = 'DcBVGk5rzdg7rmwbXyCDqqj8fJD4YPDOSa1zXz/459Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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