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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fea7e80e7f7694900023baa1834b8ff71630187e132eb81783083bce0a7d25' 
  AND token = 'HITdnX9hngpZkbqUYSckE7Jx6qZb0jucs2YN8xVgt4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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