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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3ad58f2394ee43f52befecc323cac45389a7987e8ab258b8fad7405f7bba67' 
  AND token = 'QDgU0pq0J6mo1RWXDUhEK8SFpITxuFQnBDWcoVSRraE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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