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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7343432bc48b3fbb85b99347934091539f297d1c6e056ce12412a8f7bee718e' 
  AND token = 'dAA5+FhTj+gZlN+UchActFuqiEQe9qop7pBpFQACzLM=' 
  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"
    }
  }
}