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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3907782e1cc454c0f5743356825e90c0d0fab426596a80ab8d2470a53fb41583' 
  AND token = '3BSlb35XsBICiaNK6oHJfDOc87YDNKPdIYiuv3bu44U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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