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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29635d91f42234c65961ea885c2a3d709e949fd3fbbd97850d6bf4c4d568728c' 
  AND token = 'xo0XoSxmQ5YgiNbfAY/QQHCDeCBjJ9Q3pvlO9krJses=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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