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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda1fca8605a9d19188fb09b8f600ddead15d1fadb1465b4c8658bfb395200d4' 
  AND token = 'y7UgQSTCbakqGxBbw2ftqJiQQ9yE1sZwDpQFYqTrBcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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