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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f1df044f40d5f7726b9c7ccc4def729c42e0afcd4bb0f7a3b7a43a2a410622' 
  AND token = 'ACHr+GofSdjpQ2hYtscGzSPvflWXwHIIdsrC2rTa7sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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