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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a9692e3655c07b5d07957973ea954e40b008bfb162c75b1a04e2c9fd1b79a1' 
  AND token = 'VMJenpmITiGH0pSOVo94FnCD9CTUIy7TpizmeO7FKu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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