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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e6d7f2c025119b974b4376ea70a19cdd5f7455a40db0cade437ec90ab2cc72' 
  AND token = 'hDzoR5x5+9FqB+9I0FbbSiw0FABrxdVgWd4xHguuuis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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