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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44ac1585855adf596a8a7049d62df25d9b9f9619aafa62263e8220a281015b0' 
  AND token = 'nLNrQdZBMLc+XGrizk1hmizLTr8IUuB8ayfOaZntq7w=' 
  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"
    }
  }
}