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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777c7d9b77de26cebbc0e6332bff664ca1b8e386b410b2fd1d94fdf424fa2e81' 
  AND token = 'deS6V7LGtFl0OovlPnt8QdR1QT85GW03O9cgAdA9oio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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