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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d031411a30e8fdac050706f421bc42ff99db9d8280838fec6e7c7bb9ec25079' 
  AND token = 'lQ7zivlRfWcG1NacaIar+KXG117xr9QRf60HUQmq23A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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