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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1e8564f6a996acb43f27ca78f62efa69973562ed18fcecd4893c80b1b5b419' 
  AND token = 'R0e4YnboNd0JoL3nPch+ceffcQ/wSM7o6y8Bi6LZLsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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