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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319fd2e8b8e733ee41f819b79affdba04c0609de4b04339e58e9410775088330' 
  AND token = 'ymuvllvwJV+IzEmtNTvW+Ue66cFrWqfHl+zAAmHXWDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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