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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e9d759b791fb85728dba165d79bdc0ca8518c5dd6e0da75b31f29f61eabc62' 
  AND token = '39usKsKNO0WsISRkJcbRjtyY0MYuL5Nm9Jucg6cxp2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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