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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1460f039e5a5bec12b3d367ad9c9cc7172b5d1008942a7a24e37e1430d805dd' 
  AND token = '0Uc5DZTk1M8FI5fuyIf2n95bQDmXCGbzhyr4CzNx4XM=' 
  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"
    }
  }
}