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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a874f04d991b763146bb73fb1584b5671a3ef468858722602a71649a2fbdf9f5' 
  AND token = 'TZsfQYt9+eITIPkk3ulkfdedaKNC3rMgrU86sjZMe5s=' 
  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"
    }
  }
}