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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c829145b024f48f1aee9a16850e57b9df95e4ef962c8313bcd7ddc5b02974c29' 
  AND token = 'wnvu/OWFTI6R/lQ3HO6O3MFx2zK6qMlASi4xeDvNTD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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