Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7b66419789745350bc96b9ea03a644a762d984a8889485513cf4eff84652ad' 
  AND token = 'AWkdG7uLEYzc/Mitf4r6be0AOfcpXUlDsz09bJooUoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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