Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcd1aefd911df989d0c0b199efd30a10c6c3aea76913b2a94e426f2202120c9' 
  AND token = 'xKEoBf8pkOUd/PE/xN8s2Ws358tVsPQqqxgC3ujGs8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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