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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff81405096d1f849f3c5b2e429c86652a0d8d56a15af1eb32af604d81b42ea83' 
  AND token = 'tAUDjT0/a5s5Kq2i4F5+D32PqTUItGBU9ieSyqLzD8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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