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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6125646bd77db237f803b65791943f740c7511fb36e675f8e386f4812e8d23a0' 
  AND token = 'ehsTBp8Oyy6R/uuEiDF4EWM2/Q9ZGUe57iyznOr2cUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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