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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8314a6b571507cf3033486da212f10923b4fc3fa6b6a0fbfa78c7578919a45a0' 
  AND token = 'gY3SeWcTpct0ZPLfDmHm2/6XdcQDLeB7VB7RQ02RHcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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