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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2519e381b36339fd28c602b04aff3c217364bf40ec0c775a2df47e6ef32138a7' 
  AND token = 'jqTCq9+ocf9XbPzWVqYKneeasxdhXZDqB3SiT1HzqbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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