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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559c7d2417413d161147a7c5b8bfd3dfe5b9e81754e1ed322d74cf6c858615e3' 
  AND token = 'Pdd0RO8J6d8RZOdI/JARlULhkxQiTQy/W12JiV5Z36E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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