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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0d6fdd1cef1874c8624747ccfd54a7241a7e03531736f4cb221339030d4af1' 
  AND token = 'jFsyPrjEci1XXfRja6mmektyvNLONUZ72Rd3SAQWl1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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