SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f13dba1ff8fd03d346b44b2d3638d295623be7ea1607407c7432dc500f896d' 
  AND token = '+K8j6ACajdxlmZGmkBjoPbqDVLARp8mJLFrtEPbKur8=' 
  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"
    }
  }
}