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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b889a8264b01c082c415ff7eab8d0348cb8844c4cd24a69b5e8ea4945ab34ca' 
  AND token = 'NGNHSaW1gCQQ87zk+lPKGF2RE23ZuXNpNygaYly3IAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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