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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9087fe6048b97c5a70fc0d809cfa5c6af8ac9de238a163c4ee0cc8e787b7f2b9' 
  AND token = 'GFrDkq/VjUDsIZpykaeBvB1r85fjDlTm9jKXPw3V5xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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