Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f530fb54243e2a0f1bbb8987a0bd2fdf978d713ce5a760705216770571607c37' 
  AND token = '+azqnMhe5D91IzCnIrz4T2Sok2oBRKi3xEKM6s7wJSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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