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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8764d3816c9d6f9bbedf7c160be649d25590606cdf42a67f2cc7a70cede58cfa' 
  AND token = 'LCsw0I5ZtK5a6XU+B3U79FAyJa1xFa2Ewa+tXu6jEaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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