Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a320fd7ea464c941ec380820e3d8f95c56117628e9f0667bc54578e71445e0e' 
  AND token = 'Pkuz63ZalpoAMr96K44+jtZidJKQvbBIAyhGjSs0KDs=' 
  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"
    }
  }
}