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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce54eae33c3f5a5ed8fdb65d0b2ad90a42335e31057d76784f5f7af9359aa481' 
  AND token = '9GFc1E2yT22Wttt8fHQ4VzuLkjDQb24HcoJ379OLKqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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