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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683cde9f1c90cafdb8c5587ff0111c0b563ac81718a894824d489e351e767dc3' 
  AND token = '9lpw8Tzh6Voc4BMmoJyAIcdesANXyjS9TL5Y7b9X6C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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