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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53973966b68bd56daee5babe1b608bd17eb8f56822135f47b698f099724e9618' 
  AND token = 'QB3qoictLv/yiKO8NjF50+225a9CZkg0NQ+bEjE/fR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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