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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bc032b4af1c157442e5618c28857aa606fb05b97f0b9b578a2e277390ec68f' 
  AND token = '8tg0/FOjI0YVyyoWO0AE+qobMpoXQqk+BtQCOAjwRd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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