Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0bb108729683ee4975671dd3e61901553c199c81ed255890a767d67bd5f502' 
  AND token = 'gP4mH+99FbOYpCSOkt+4nz1vRDnfuBloSF1WYCW3Sq0=' 
  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"
    }
  }
}