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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173b8316a65a29997328f2a7f383d0ae71cfb181ce616a4f3c0c75af274ab81d' 
  AND token = 'FUqwJpsby/aqoCrOuInMHa+Y8cYWQa9SqPR6tBK6In0=' 
  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"
    }
  }
}