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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80973d48bbb4d41fefea5099b359af158c58498bd403acdfe4bcb76e92b17d38' 
  AND token = 'ZnYjnHBFbCJo1LHS2GYBOcze+K45zurnHhzlnnD0v24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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