Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8437de4c691406f564eef9ae458bd9a1824269f32f832c67d550c326df1d7e39' 
  AND token = '8N0XEqVHbYAE0D/vLBz/unTs++s55SOBlCDf7xtI3co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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