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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb55a29eea7ab624bde22d532e08725cf311fae4b7fde81d582a895cf0f42357' 
  AND token = 'Gh1C0O/VH5dLvyJzbpZlAOLJbMDxwoesDGrrh9ThJg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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