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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76272574c0c3304740aeab1e531febd748997c1a909312b7afefa47a24ff9710' 
  AND token = '0N4F1bj/pqdLIb4dBdvZF+Gs75Ojcf0NNpeYNc7UdDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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