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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3368869e642c675d4b2ad1f5bf451f3e9bd24496d52deeb4057b9f293db46a07' 
  AND token = 'TbyEr5jJv3gei7NdjhtRcJMj3BE4+ElR7JFKFfbqEJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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