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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aaacfcb3263e9124fc1987d0ca4ba4fc8aa8b27baa24d571cfb5bc9d04e0236' 
  AND token = 'bDic84etN265LX/agolRx7P7qt4BQpnZREjEZShG2H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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