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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99802b7dcf303869e1328f01814038018f0229be6c2f6d44b1cd7bec47741162' 
  AND token = 'BByBgCvA36eSFu8wsoL5+66pwfWkia4HhmT7gf9cTl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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