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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611307db3a94111a8e20f7be3be52739dc6cc953965ef245e00c5c4249c46f5a' 
  AND token = 'iaRpjCe14juNg2dzuPcGRgE++XlglgWtrGDBHFZAoDs=' 
  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"
    }
  }
}