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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f4d0647fcaa262855900a0a988ca0da8ac9cce362107fdacb7a270fc1689e2' 
  AND token = 'cW73MW3c7B2CGe2y7iXZzo+uFMR7jWJ6TEoMZIJCFJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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