Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135fa5932c3e07a808b7f7a0a48311516e3393e274bc58dabda7a693b6e2f7e3' 
  AND token = 'ysEHN3NgWw41BQYaRhFblABy0xYb7qtVq389OqoODac=' 
  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"
    }
  }
}