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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab30501b9425a262b4bb87974dfc97fd482fb09ebb7525eee3c9e73a1e474ff' 
  AND token = 'rpXuyXeuBDKWESQJFtVO9xJC2ptWy3/9I0dCIzjaldg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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