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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d50006bf0fe8a31342a4b531df0f0cf8395b47dbf0bc276605e42f014354868' 
  AND token = 'v9pAweuEE5AVT5hzcJQL6ze7PHHPyQG36yjDBVybSac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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