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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f8aae9c7ddd15e822856cb95154102b7ed4417d5043edbd2c518c13363a6c8' 
  AND token = 'QkSJef1GBMd86QAaYBYOhqjIIB0TJZVqIGGUJB2MoA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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