Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607bfb4c31a22bc74754ad812d9d89f1f4e5dd525b3e0301dbd52ec5f9417d3b' 
  AND token = 'RjDmpGs2BUwJO0P3QWJoeZe6WyRRSOMvU2SKPX8mvEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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