SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77565b8db0a40b184bebecbb396a4921931ce600803d2fd0ea1b2004af352893' 
  AND token = 'gXOqx6BRhChJSYrlshXWnuWAWtw/WzzUmqu2wXv3tVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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