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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bbd3036a35d9acaeaa369478b469a9981c4f77cc4c358ac9f3f23f52384c6f' 
  AND token = 'PzshL/g9/Tyo+lnEdxki96hEDU37eg/aGNE5dwXUVxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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