SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6526eb0210cec00117c8b7329a90ddf3e54dd3580fc6f799b284d3965d78702b' 
  AND token = 'j0l/KS+mBH0fTYRGmVX9uGFu3QUvLRc3PqjStnaYhB0=' 
  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"
    }
  }
}