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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35483a5bbfaec6ce7a3a85068d6f16ba78ef72f00cac07b4092c60ad4964bc94' 
  AND token = 'uYWuMZkWkKqF/irLupFnitdzTZSpG/QNGP5tD6h2cxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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