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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b1d4c704e5b0582933d6e277a8ca0c2bbab09457d3508bd993254953914383' 
  AND token = 'kftxWoHfao0bDjHZkBF1Ukgd4d+HQPAQOb9BKkYoLsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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