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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f8c23fb18a1fea35a347b080727dfb63832328a13b9f5715d0735a711d99c1' 
  AND token = 'fgasOCgeDZ0Ii40YXRrPqIGbkdNhSOMauidqJX5JEBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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