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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f54db64d04cb678cdc62a827bf2df7f67346947a9befa188b93485be2ae107' 
  AND token = '6eKMgFsTFkYtejnGee1WuJxKvBvBTovlOc2Id++5H9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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